Been brushing up on my atmospheric chemistry before posting (prof Thomson would so be pleased, only got 8% in the exam )
** warning. the following may contain chemistry, take all necessary precautions **
"During flight aircraft emit a number of pollutants which have varying effects on the environment, the main ones being:
Carbon Dioxide
Nitrogen Oxides
Sulphate and soot aerosols
Water vapour
Concerning the formation of contrails the main pollutants are water vapour and aerosol particles (soot, nitric acid and hydrocarbons).
Aircraft contrails form in the upper troposphere, where temperatures are cold, therefore contrails consist of ice particles, in which respect they are similar to cirrus clouds. Generally, for a contrail to form, there must be water vapour present and aerosol particles, such as soot, for the water vapour to condense on, and the ambient atmospheric conditions must also be suitable. The relative humidity (RH) of the surrounding air must be high enough (supersaturated) or the water vapour emitted by the aircraft will increase the saturation to the point where condensation occurs. If the ambient air is already at super saturation then it is likely that other clouds will also be present, if however super saturation is reached by the input of water vapour from the aircraft then it is likely that only contrail related cloud will be present. It is under these conditions that there is most concern over the occurrence of contrails as it produces a situation where clouds are formed anthropogenically in a sky that would otherwise have been cloud free." ~ my notes circa 2004.
Mostly seen in the UK over a diagonal from Liverpool- Birminghamabad to Londonistan.
So, even before they put things in the contrail- turning it into a chemtrail, you high more high altitude clouds forming, which means more lower clouds forming and therefore rain- weather modification.
Like when the stopped planes flying after 11/9/01 - the global temperature during the day was 1 degree C colder, and the night was 1 degree C warmer.
As for the Stronium, we're talking parts per million in these trails, even at ground level- we inhale more platinum walking beside a busy road. Yes, it's used in cloud seeding as is Silver Nitrate (now that's a nasty bugger).
If they were putting anything drug-like in the trails, it would just break up from the high temperature. UV up there- and if they did it a low altitude, would need a metric feckton (an irish scientific measurement) of it to have any effect- may as well put it in the drinking water, to get a bigger bang for less stuff.
Oh, you want to try breathing SF6 sometime, does the inverse of helium , makes your voice deeper-
http://youtu.be/d-XbjFn3aqE
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